IGF-1 Dosing, Results Post Cycle Only?

I just got off the phone with a close friend who has been running IGF-1 on and off for the past year. He told me that was running it at around 10-11mcgs per day injected subQ because he read up on it and Dave Palumbo recommend doing it that way. He elaborated on it by saying that anything higher and the receptors get used to it too quickly.

After all was said and done, he still isn’t sure if the IGF-1 helped him with gains at all in light of the Test and Tren he was taking on and off after the IGF-1. Is there truth to this way of thinking?
Can one expect to see gains during a cycle of IGF-1(granted training and diet are adequate), or do the gains only come after the cycle due to the maturation of the new cells created by the IGF-1 and expanded on with AAS usage post cycle?